Maximizing purity and recovery of carbon dioxide from biogas by equalized pressure swing adsorption using UiO66 adsorbent
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Date
2018-06
Authors
Tan, Wern Ke
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Abstract
High price of natural gas due to high demand and environmental issues that caused by
releasing methane and carbon dioxide (greenhouse gases) from biogas make biogas
upgrading necessary. In this study, UiO66 adsorbent in pressure swing adsorption
(PSA) processes was selected for biogas upgrading. The UiO66 adsorbent was
prepared and characterized using X-Ray Diffraction (XRD) analysis, Brunauer–
Emmett–Teller (BET) Analysis, Scanning Electron Microscope (SEM) analysis,
Energy Dispersive X-Ray (EDX) analysis and Particle Size Analysis. The
characterization tests showed that UiO-66 was mesoporous, slit-shaped, has low BET
surface area and crystalline structure. Breakthrough study was carried out on the
UiO66 adsorbent with feed gas composition (30%CH4 - 70% CO2) under 3 bar. CO2
is the slightly strong adsorbed species compared to CH4 in a UiO66 adsorbent which
was proven by its slightly longer breakthrough time than CH4 breakthrough time.
Blowdown and adsorption time were selected based on breakthrough and saturated
time and applied in PSA to obtain purity and recovery of CO2 and CH4. Maximum
purity and recovery of CO2 are 82.70% and 36.24% respectively whereas maximum
purity and recovery of CH4 are 38.22% and 86.92% respectively at 3.2 minutes of
adsorption time and 3 minutes of blowdown time under 3 bar.